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Because Critical Mass takes place without an official route or sanction, participants practice a tactic known as "corking" in order to maintain the cohesion of the group. This tactic consists of a few riders blocking traffic from side roads so that the mass can freely proceed through red lights without interruption. Corking allows the mass to engage in a variety of activities, such as circling in an intersection, or lifting their bikes in a tradition known as a Chicago hold-up. The 'Corks' sometimes take advantage of their time corking to distribute flyers.